Serhiy Storchaka added the comment:

Here is a patch for UserDict, that keep current behavior, but allows to pass 
keys "self" and "dict" if positional parameter dict is specified.

>>> UserDict(self=42)
{'self': 42}
>>> UserDict({}, dict=42)
{'dict': 42}
>>> UserDict(dict={'a': 42})
{'a': 42}

----------
Added file: 
http://bugs.python.org/file38692/UserDict_self_and_dict_keywords.patch

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<http://bugs.python.org/issue22609>
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